Study On Synthetic Drainage Of High Slope Of Highway In The Qinling Mountains

The water damage of highway slope in the mountain area is comparatively serious in our country .Through investigation of the water damage of multiple-highway slope,it has been discovered that the Slope water disasters occured frequently in the road sections where the slope drainage system is imperfect.Therefore, set up the slope drainage system reasonably has the important practical significance in reducing the slope water damage and promoting the economy development of mountainou area.The paper combined with geographical environment characteristics of the Qin-ling mountains and the high slope engineering of the express highway from Xi'an to Hanzhong,and adopting methods of field investigation, theory analysis, model experiments etc,research and discuss of the design method of the slope drainage system.The geographical environment of the Qin-ling mountains is very complex.With analyse,the environmental factors that have a great influence on the slope protection and slope drainage including: the terrain landform, the geology, the vegetation and the rainfall, Among these factors, the influence of the rainfall on slope is the biggest.It mainly show the erosion of rainfall to slope and the influence of rainfall infiltration to the slope stability.Based on the analysis of the mechanism of slope rainfall damages, the basic principle of slope protection and slope drainage is induced;the establishing principle,method,the reasonable section form and size,the scour protection measures of inlet and outlet,and the reinforcement and seepage control measures of drainage ditches etc.,of each drainage facilities of high slope are proposed;and the analysis of the hydraulic and hydrologic computing method in slope drainage is carried on.Though analysis of different slope protection forms, it is put forward that the vegetation protection and comprehensive protection measures should be adopted priority.The synthetic drainage setting of high slope is to make the drainage facilities connected up properly and matched mutually each other,make the drainage facilities together with slope protections, though the overall design of the drainage system,it will get the slope drainage systems combined with each other, and linked up with the natural ditches in the roadarea,which will drain water out of the road smoothly.The analyses of the joinment and the matching of the drainage facilities such as intercepting drain,chute,side ditch,drainage ditche and culvert etc are done.And the design method of the synthetic drainage of high slope of highway is put forward.The paper has summarized and analysyzed the natural geographical conditions and high slope types along express highway from Xi'an to Hanzhong,and selected five typical high slopes for the design of the slope drainage system and the observation of its effect.